An Example of the Use of Interdigital PVDF Transducers to Generate and Receive a High Order Lamb Wave Mode in a Pipe

Wilcox, PD; Castaings, Michel; Monkhouse, R.; Cawley, P.; Lowe, M. J. S.

doi:10.1007/978-1-4615-5947-4_120

Cited by 7 publications

(3 citation statements)

References 6 publications

(10 reference statements)

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“…Angle of incidence plots simplify the use of angle-beam transducers by showing directly what angle needs to be used. Other program options aid the design of interdigital (or 'comb') transducers [9]. The danger of exciting multiple modes can be easily indentified.…”

Section: Using the Curvesmentioning

confidence: 99%

Disperse: A General Purpose Program for Creating Dispersion Curves

Pavlakovic¹,

Lowe²,

Alleyne³

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

413

287

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Mechanical Engineering Oepartment Exhibition Road, London SW7 2BX INTROOUCTIONThe application of guided waves in NOT can be hampered by the Iack of readily available dispersion curves for complex structures. To overcome this hindrance, we have developed a general purpose program that can create dispersion curves for a very wide range of systems and then effectively communicate the information contained within those curves. The program uses the global matrix method to handle multi-layered Cartesian and cylindrical systems. The solution routines cover both leaky and non-leaky cases and remain robust for systems which are known to be difficult, such as !arge frequency-thicknesses and thin layers embedded in much thicker layers. Elastic and visco-elastic isotropic materials are fully supported; anisotropic materials are also covered, but are currently limited to the elastic, non-leaky, Cartesian case.An extremely !arge amount of work has already been clone to describe the wave propagation in layered systems, which began in the late nineteenth century and continues today There is not enough space in this paper to describe the contributions that many excellent researchers have made to the field. Instead, this paper describes how we have combined some of this previous work and our own research to create a robust, user friendly, general purpose tool. A review of matrix techniques as they apply to modelling ultrasonic waves in multi-layered media is given in (1).When creating dispersion curves, the displacements and stresses for each type of material and geometry are described in a materiallayer matrix. By satisfying the given boundary conditions at each interface, the individuallayer matrices are assembled to describe the behaviour of the entire system. The dispersion curves then emerge as solutions to the assembled system of equations.Once the dispersion curves are generated, our program provides many easy methods to explore and use the information contained within the curves. A mode shape display continually updates the distribution of stresses, displacements, and energy as points are selected on a dispers10n curve. The phase velocity, group velocity, attenuation, real wave-number, angle of incidence, etc. can be shown and compared. In addition, an interface to our finite element program allows the interaction of gutded waves with defects to be examined.The program has been developed as a by-product of our research. It has proven to be a valuable tool for understanding wave propagatwn in complex systems and transferring that understanding to new ultrasomc testwg applications

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Section: Using the Curvesmentioning

confidence: 99%

Disperse: A General Purpose Program for Creating Dispersion Curves

Pavlakovic¹,

Lowe²,

Alleyne³

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

413

287

View full text Add to dashboard Cite

show abstract

“…Temperature variations with respect to baseline measurements can also be compensated by signal stretching 16 . Notwithstanding, the drawbacks of guided‐wave deployment are mainly related to added complexity and weight implied by the utilization of cables, electronic management units, and power sources, as well as to the postprocessing complexity that is exacerbated when higher order modes are excited 17 . Minimizing these drawbacks can be tackled through a precise understanding of the wave characteristics and judicious selection and placement of transducers.…”

Section: Introductionmentioning

confidence: 99%

Robust optimal sensor configuration using the value of information

Cantero‐Chinchilla

Papadimitriou

Chiachío

et al. 2022

Structural Contr & Hlth

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Sensing is the cornerstone of any functional structural health monitoring technology, with sensor number and placement being a key aspect for reliable monitoring. We introduce for the first time a robust methodology for optimal sensor configuration based on the value of information that accounts for (1) uncertainties from updatable and nonupdatable parameters, (2) variability of the objective function with respect to nonupdatable parameters, and (3) the spatial correlation between sensors. The optimal sensor configuration is obtained by maximizing the expected value of information, which leads to a cost-benefit analysis that entails model parameter uncertainties. The proposed methodology is demonstrated on an application of structural health monitoring in plate-like structures using ultrasonic guided waves. We show that accounting for uncertainties is critical for an accurate diagnosis of damage. Furthermore, we provide critical assessment of the role of both the effect of modeling and measurement uncertainties and the optimization algorithm on the resulting sensor placement. The results on the health monitoring of an aluminum plate indicate the effectiveness and efficiency of the proposed methodology in discovering optimal sensor configurations.

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“…However, since in these techniques multiple wave modes are generally generated and the individual modes are usually dispersive, the received signals are very complex and difficult to interpret. An attractive way to deal with this problem has recently been introduced by applying interdigital transducer (IDT) technologies, which are commonly used in electronic systems, [2]. The basic configuration of an IDT consists of an interdigital electrode pattern deposited on a piezoelectric substrate.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Lamb waves in composite laminated plates excited by interdigital transducers

Veidt

Liu

Kitipornchai

2002

NDT & E International

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The technique of permanently attaching interdigital transducers (IDT) to either flat or curved structural surfaces to excite single Lamb wave mode has demonstrated great potential for quantitative non-destructive evaluation and smart materials design. In this paper, the acoustic wave field in a composite laminated plate excited by an IDT is investigated. Based on the discrete layer theory and a multiple integral transform method, an analytical-numerical approach is developed to evaluate the surface velocity response of the plate due to the IDT's excitation. In this approach, the frequency spectrum and

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An Example of the Use of Interdigital PVDF Transducers to Generate and Receive a High Order Lamb Wave Mode in a Pipe

Cited by 7 publications

References 6 publications

Disperse: A General Purpose Program for Creating Dispersion Curves

Disperse: A General Purpose Program for Creating Dispersion Curves

Robust optimal sensor configuration using the value of information

Modelling of Lamb waves in composite laminated plates excited by interdigital transducers

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